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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PSD312 датащи(PDF) 29 Page - STMicroelectronics |
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PSD312 датащи(HTML) 29 Page - STMicroelectronics |
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29 / 85 page  PSD3XX Family 26 13.0 Program/Data Space and the 8031 This section only applies to users who have an 8031 or compatible MCU that outputs a signal such as PSEN when accessing program space. If this applies to you, be aware of the following: t The PSD3XX can be configured using PSDsoft such that the EPROM is either 1) accessed by PSEN only (Figure 10); or 2) accessed by PSEN or RD (Figure 9). The default is PSEN only unless changed in PSDsoft. t The SRAM and I/O Ports (including CSIOPORT) can not be placed in program space only. By default, they are in data space only (Figure 10). However, the SRAM may be placed in Program and Data Space, as shown in Figure 9. Figure 9. Combined Address Space INTERNAL OE OE OE CS CS CS RD ADDRESS PSEN I/O PORTS PAD SRAM * EPROM INTERNAL OE OE OE CS CS CS RD ADDRESS PSEN I/O PORTS PAD SRAM * EPROM Figure 10. 8031-Compatible Separate Code and Data Address Spaces *Not available on “R” versions. *Not available on “R” versions. |
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